Boxee is now in public alpha for Mac, Ubuntu, and Apple TV (that means available for everyone!), and in private alpha for Windows. If you remember before, the private alpha isn't a deal-breaker; request a download and you'll usually receive one in a week or two. Besides wider availability, Boxee has also added support for Joost and BBC iPlayer, though the latter will only work in the U.K. They've also expanded the use of MTV Music, adding search and browse options. [New York Times]